kdelibs3 FTBFS against openssl-1.1, build.log snippet,

ksmimecrypto.cc: In member function 'stack_st_X509* KSMIMECryptoPrivate::certsToX509(QPtrList<KSSLCertificate>&)':
ksmimecrypto.cc:42:23: error: 'class KOpenSSLProxy' has no member named 'sk_new'; did you mean 'SSL_new'?
 #define sk_new kossl->sk_new
                       ^
ksmimecrypto.cc:90:62: note: in expansion of macro 'sk_new'
     STACK_OF(X509) *x509 = reinterpret_cast<STACK_OF(X509)*>(sk_new(NULL));
                                                              ^~~~~~
ksmimecrypto.cc: In member function 'void KSMIMECryptoPrivate::MemBIOToQByteArray(BIO*, QByteArray&)':
ksmimecrypto.cc:245:36: error: invalid use of incomplete type 'BIO {aka struct bio_st}'
     reinterpret_cast<BUF_MEM *>(src->ptr)->data = NULL;